Shaun N. Casteel, Purdue University Extension Soybean Specialist

Transcription

1 Shaun N. Casteel, Purdue University Extension Soybean Specialist Casteel, Purdue University - 1

2 EPA, Casteel, Purdue University - 2

3 Grain lb/bu 50 bu 75 bu 100 bu Nitrogen P 2 O K 2 O Sulfur IPNI, Casteel, Purdue University - 3

4 2017 Casteel, Purdue University - 4

5 N P K Ca Mg 3.5 to to to to to 0.60 N P K Ca Mg 3.25 to to to to to 0.70 Manganese Zinc Copper Boron 17 to to 80 4 to to 60 Soy chapter Sabbe et al., Casteel, Purdue University - 5

6 2011 & 2012: W. Lafayette 2017 Casteel, Purdue University - 6

7 2011 & 2012: W. Lafayette 2017 Casteel, Purdue University - 7

8 2017 Casteel, Purdue University - 8

9 Rice Rescue: July 2, 2015 Rice Happy: July 2, 2015 Rice Rescue, July 2, Casteel, Purdue University - 9

10 Rice Rescue: Aug 3, lb N/ac 40 lb N/ac 2017 Casteel, Purdue University - 10

11 Yield (bu/ac) * * UTC Urea 40 Urea 20 AMS 20 AMS 10 Coron 10 UAN 10 Task Mn Priaxor Stratego Rachet X-cyte Bio-forge C + TF C + P C + R C+TF+P+R 2017 Casteel, Purdue University - 11

12 Yield (bu/ac) UTC Urea 40 Coron 10 Task Force Priaxor Bio-forge CN C + TF C + P LaCrosse, IN Casteel, Purdue University - 12

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14 Untreated 20 lb S/ac with MES10 or AMS Single 5 lb S/ac at: V4, R2, R4, R6 Sequential foliar 5 lb S/ac per pass V4 + R2 V4 + R4 R4 + R6 V4 + R2 + R4 + R Casteel, Purdue University - 14

15 LaCrosse, IN July 15, Casteel, Purdue University - 15

16 Nitrogen Conc. (%) c ab a b a a 0 Fisher s Protected LSD Casteel, Purdue University - 16

17 Sulfur Conc. (%) d a ab ab b c Fisher s Protected LSD Casteel, Purdue University - 17

18 N:S Ratio a bc c b bc b Fisher s Protected LSD Casteel, Purdue University - 18

19 Yield (bu/ac) d abc a abc ab c c c bc c d 10 0 Fisher s Protected LSD Casteel, Purdue University - 19

20 20 lb S/ac: to 12.5 bu Single 5 lb S/ac: + 6 to 10 bu Sequential foliar combos: up to 12 bu No response (i.e., crop phytotoxicity) with foliar applications at all four timings (V4, R2, R4, R6) 2017 Casteel, Purdue University - 20

21 LaCrosse, IN Sept 7, Casteel, Purdue University - 21

22 LaCrosse, IN Sept 7, Casteel, Purdue University - 22

23 LaCrosse, IN Casteel, Purdue University - 23

24 LaCrosse, IN Casteel, Purdue University - 24

25 Yield (bu/ac) d a ab cd bcd cd cd cd abc abc + 4 to 7 bu with foliar AMS d Fisher s Protected LSD Casteel, Purdue University - 25

26 2017 Casteel, Purdue University - 26

27 2017 Casteel, Purdue University - 27

28 2017 Casteel, Purdue University - 28

29 2017 Casteel, Purdue University - 29

30 2017 Casteel, Purdue University - 30

31 2017 Casteel, Purdue University - 31

32 LaCrosse, IN Casteel, Purdue University - 32

33 AMS 20 lb S AMS:ES UTC LaCrosse, IN Casteel, Purdue University - 33

34 20 lb S/ac: + 13 bu Similar to 2016 Single 5 lb S/ac: + 4 to 7 bu Not as good as 2016 Sequential foliar combos: + 5 to 7.5 bu No response (i.e., crop phytotoxicity) with foliar applications at all four timings (V4, R2, R4, R6) Not as good as Casteel, Purdue University - 34

35 Grain lb/bu 50 bu 75 bu 100 bu Nitrogen P 2 O K 2 O Sulfur IPNI, Casteel, Purdue University - 35

36 Timing of Application Fertilizer Source Severity or Need Soil Type Field Conditions Starting point is ~20 lb S/ac on broadcast fertilizer late spring to early vegetative growth What about foliar sprays? 2017 Casteel, Purdue University - 36

37 Soil test? Mehlich-3 extraction for S closer to planting may help no guarantees Late Spring Broadcast of 20 lb S/ac AMS, AMS:ES blends, MES10, Sul-Po-Mag, Gypsum Elemental S probably won t oxidize fast enough Wait and See: Leaf Nutritional Snapshot May need to consider application close to critical S levels (0.25%) or near the 20:1 (N:S ratio) maybe more like ~18: Casteel, Purdue University - 37